Now there’s a strange combination. He started his career as a mix-and-match Warrior and Shepherd God. Did he fight sheep? Lead lambs to the slaughter? No, he protected flocks — and was liable to get quite assertive about it.
As time went on, people began to depict him with the horns of a ram or bull. This seemed to sum up his demeanor quite nicely. Meanwhile, it seems his down-to-earth nature had made him the ideal candidate for Underworld Management.
Now this is the purest speculation, but we wonder if he shared the same fate as PAN when Christianity came along. You can just imagine the missionaries thinking: "hmm... horns... associating with animals... lots of fighting... the Underworld... It’s SATAN trying to disguise himself as a shepherd again."